background preloader

Des scientifique fabriquent la vie sans ADN !

Des scientifique fabriquent la vie sans ADN !
Scientists trying to create artificial life generally work under the assumption that life must be carbon-based, but what if a living thing could be made from another element? One British researcher may have proven that theory, potentially rewriting the book of life. Lee Cronin of the University of Glasgow has created lifelike cells from metal — a feat few believed feasible. The discovery opens the door to the possibility that there may be life forms in the universe not based on carbon, reports New Scientist. Even more remarkable, Cronin has hinted that the metal-based cells may be replicating themselves and evolving. "I am 100 percent positive that we can get evolution to work outside organic biology," he said. The high-functioning "cells" that Cronin has built are constructed from large polyoxometalates derived from a range of metal atoms, like tungsten. The metallic bubbles are certainly cell-like, but are they actually alive? The early results have been encouraging.

http://www.mnn.com/green-tech/research-innovations/stories/scientist-creates-lifelike-cells-out-of-metal

Des souris avec des cellules cérébrales humaines sont plus intelligentes Un astrocyte (en vert) a, comme son nom le laisse entendre, une forme caractéristique en étoile. Ses digitations le connectent à de nombreux neurones simultanément, lui permettant d'intervenir sur un grand nombre de connexions à la fois. © Han et al., Cell Stem Cell Des souris avec des cellules cérébrales humaines sont plus intelligentes - 2 Photos Human Body Board Game Subjects Science --Life Sciences ----Biology Grade Les jeux freinent le déclin mental des gens âgés Si les jeux vidéo sont parfois décrits comme mauvais pour les enfants, ils seraient au contraire bons pour les plus de 50 ans, mobilisant et améliorant leurs facultés cognitives, affirme une étude américaine publiée cette semaine. Les centaines de personnes de plus de 50 ans observées par des chercheurs de l'Université de l'Iowa ont montré des signes d'amélioration de leurs capacités cognitives et de recul de plusieurs années du déclin lié à la vieillesse. Il s'agit de la dernière d'une série d'études qui visent à comprendre pourquoi, en vieillissant, on perd ces fonctions majeures du cerveau qui assurent le fonctionnement de la mémoire, de l'attention, de la perception et de la résolution de problèmes. Dans ce cas, 681 personnes en bonne santé ont été réparties en quatre groupes témoins, à l'intérieur desquels ont également été séparés les 50-64 ans et les plus de 65 ans. Le but est de monter en niveaux de difficulté.

Easy Science Experiments Hands-on science experiments at home or in the classroom are a fun way to engage kids and get them excited about science. Today’s sites house hundreds of easy experiments that can be done with supplies that you probably have around the house, or can get at the grocery store. Exploratorium: Science Explorer5 stars"Get messy, get airborne, get loud, get shocked!" San Francisco's Exploratorium hands-on science museum offers a sampler of thirty simple experiments excerpted from two "Science Explorer" books. Elsewhere they provide a hundred more experiments called "snacks" because they are both fun and easy. The Science Snacks are organized by category, or listed alphabetically on a single page (where you can use your browser search function to find something specific.)

300 millions d'ans UFO dents de roues trouvait dans la ville russe de Vladivostok During a cold winter evening a resident of Vladivostok found a rail-shaped metal detail which was pressed in one of the pieces of coal that the man used to heat his home. Mesmerized by his discovery, the responsible citizen decided to seek help from the scientists of Primorye region. After the metal object was studied by the leading experts the man was shocked to learn about the assumed age of his discovery. The metal detail was supposedly 300 million years old and yet the scientists suggest that it was not created by nature but was rather manufactured by someone. The Cell and its Organelles Lists of Nobel Prizes and Laureates The Cell and its Organelles Play the Incredible Megacell Game About the game An ultracentrifuge is used for separating the organelles in the cell according to their size, shape and density.

Miniature Chameleons Discovered—Fit on Match Tip Photograph courtesy Frank Glaw Match-tip tiny, Brookesia micra (juvenile pictured) is the smallest of four new chameleon species found on the African island country of Madagascar. With an average adult length of just over an inch (2.9 centimeters) from snout to tail, B. micra is among the tiniest reptiles in the world. (Related: "Record-Breaking Chameleons Live Only a Few Months.") Scientists think the diminutive new chameleon species might represent extreme cases of island dwarfism, whereby organisms shrink in size due to limited resources on islands. "The extreme miniaturization of these dwarf reptiles might be accompanied by numerous specializations of the body plan, and this constitutes a promising field for future research," study leader Frank Glaw of Germany's Zoological State Collection said in a statement.

Searching chromosomes for the legacy of trauma Klaus Tätzler/Lower Saxony Memorials Foundation The Bergen­‐Belsen Memorial, in the grounds of the former Nazi concentration camp where the author's father was incarcerated. On 23 April 1945, my father, Gershon Glausiusz, was liberated from the Nazis. He was ten years old.

Related: